Cut-off valve



(No Model.)

O, B. TURNER.

CUT-OFF VALVE.

No. 286,747. Patented OOt. 16, 1883.,

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r UNITED STATES PATENT. OFFICE.

CHESTER B. TURNER, or DETROIT, MICHIGAN.

CUT-OFF VALVE.

SPECIFICATION forming To all whom, it may concern Be it known that I, CHESTER B. TURNER, of Detroit, in the county of -VVayne and State of Michigan, have invented new and useful Improvements in Steam-Engines; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had 'to the accompanying drawings, which form a part of this specification.

This invention relates to certain new and useful improvements in cut-off valves, and is especially designed as an improvement upon the patent issued to me, dated May 3, 1881, and numbered 241,093.

The invention consists in the peculiar construction of its parts and their combinations and arrangement, by means of which the engine may be compelled to act as a direct-acting engine or as a compound engine, as desired, and as more fully hereinafter described.

Figure 1 is a vertical longitudinal section. Fig. 2 is a plan of the supplemental valveseat, and Fig. 3 is a plan View of the supple mental valve and its connections detached- In the accompanying drawings, which form a part of my specification, A represents the larger, and B the lesser, cylinder. 0 are the steam-passages leading from the lesser to the greater cylinder, opening out of the lesser at points a, or about one-quarter of the distance from each head thereof as compared to the length of the stroke of its piston D, which is constructed as a valve-piston, between the two heads 'of which the eXhaust-port E of the larger cylinder exhausts. F is the piston of the larger cylinder. Gis the steam-chest of the smaller cylinder, and H 'is the slide-valve, which alternately closes and discloses the ports I and exhaust-port of this latter-named cylinder. The rods of the two pistons of the two cylinders are designed to be connected with the main driving-shaft, as described in the aforesaid Letters Patent. J is a supplemental steamchest secured to the cover of the steam-chest proper, said cover being provided with radial openings K. M is a stem, the lower end of which is suitably stepped in the cover of the steam-chest proper, and carries the disk-valve L, which is provided with a series of radial arms, 0, which are designed to close and disclose the coincident openings in the cover of the steam-chest proper. The stem. is made steam -tight where it'passes part of Letters Patent No. 286,747, dated October 16, 1883. Application filed August 8, 1883. (No model.)

through the cover of the supplemental chest by means of the stuffing-box N. Outside the stufiing-box the two-armed lever or disk P is sleeved on the stem, and to the hole Q therein the eccentric-connection is made. I Secured to the outer end of this stem is the L-shaped lever, R, one arm of which is hollow to inclose the pin S, which is surrounded by the coil spring T. The pin terminates in the head U, below which is the stop V, which is designed to engage with the corresponding slot W in the hollow part of the arm. The object of this supplemental steam-chamber and its connections above described is to afford means for cutting off the steam at any desired part of the stroke. Steam is taken into the supplemental steam-chest, and when the openings in the disk-valve are coincident with the openings in the cover of the steam-chest proper the steam passes into the smaller cylinder, and thence is allowed, by the position of the piston D, to enter the larger cylinder, as described in my aforesaid Letters Patent.

If it is desired to work the engine as a compound engine, the pin S is engaged with the hole I) in the disk 1?, by which means the eccentric is compelled to give motion to the cutoff valve, so that the two pistons are compelled to act by direct pressure and by expansion, as may be desired. What I claim asmy invention is 1. The combination, with a compound engine, of a supplemental steam-chest arranged stem M, in combination with the L-shaped arm R and pin S, the parts being constructed and arranged and operating substantially as and for the purposes setforth.

CHESTER B. TURNER. Witnesses:

H. S. SPRAGUE, E. ScULLY.

IOO 

